Compactly-arranged lubricating oil system for small and medium-power gas turbine power station

Abstract

The invention relates to the field of gas turbines, in particular to a medium and small power gas turbine power station compactly-arranged lubricating oil system which comprises a box body bottom frame, a gas turbine is arranged on the box body bottom frame, and a generator located on the box body bottom frame is arranged on one side of the gas turbine. The gas turbine is connected with the generator through a gear box coupler arranged on a box body bottom frame, a circulating oil tank is arranged between the gas turbine and the gear box, and the maximum liquid level height of the circulating oil tank does not exceed the lowest liquid level of the gear box. Through the compact structural design and position arrangement of the oil tank, the oil supply pipeline and the oil return pipeline, the lubricating oil system and main components such as a gas turbine, a gear box and a generator in the gas turbine power station can be placed in the tank body together, the lubricating oil system is integrated into the tank body, and lubricating oil is provided for the main components of the power station through the single oil tank; overall transportation of the power station box body is facilitated, and the overall occupied area of a power station is effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of gas turbines, and more specifically to a compactly arranged lubrication oil system for small and medium power gas turbine power plants. Background Technology

[0002] A gas turbine is an internal combustion engine that uses a continuously flowing gas as its working fluid to drive a high-speed rotating impeller, converting the energy of fuel into active power. Compared to other power plants, gas turbines have the advantages of extremely high power density, meaning they are lightweight, compact, and have high power output. A gas turbine power plant is a device that uses a gas turbine as its primary power source, with the gas turbine rotor driving a gearbox rotor and a generator rotor to produce electricity.

[0003] Compared to other power generation equipment, gas turbine power plants have the advantages of simple equipment, convenient installation, no need for water, and fast start-up. As a distributed power station and vehicle-mounted emergency power source, they have significant advantages and great development potential.

[0004] In the aforementioned application scenarios, a high level of integration and a low footprint are desirable for gas turbine power plants to save installation time and space. Besides the essential enclosure, gas turbine, gearbox, generator, and intake / exhaust systems, gas turbine power plants also require auxiliary equipment such as lubrication systems, fuel systems, and combustion systems to ensure smooth operation. Typically, these auxiliary systems are mounted on separate skids outside the gas turbine enclosure, requiring individual installation, which undoubtedly increases installation difficulty and footprint. Summary of the Invention

[0005] This invention addresses the technical problems existing in the prior art by providing a compactly arranged lubrication oil system for small and medium power gas turbine power plants.

[0006] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A compact arrangement lubricating oil system for a small and medium power gas turbine power plant, the system including a housing base frame, as shown in the attached figure. For the convenience of viewing the overall structure of this application, the wall panels of the housing base frame are hidden in the attached figure. A gas turbine is installed on the housing base frame, and a generator is installed on one side of the gas turbine on the housing base frame. The gas turbine is connected to the generator through a gearbox coupling installed on the housing base frame. A circulating oil tank is installed between the gas turbine and the gearbox. The flow rate of the circulating oil tank should be 1 to 1 times the circulation volume of the lubricating oil system per minute. Due to space limitations, the flow rate of the circulating oil tank in this invention is 1 to 1 times the circulation volume, with a 1% margin. The maximum liquid level of the circulating oil tank does not exceed the minimum liquid level of the gearbox to prevent poor oil return from the gearbox. The circulating oil tank is equipped with a main control oil pump, an auxiliary oil supply pump, a pneumatic three-way valve, a dual filter, and a self-regulating pressure regulating valve. The height of the main control oil pump and the auxiliary oil supply pump is lower than that of the pneumatic three-way valve, the dual filter, and the self-regulating pressure regulating valve. Because the main control oil pump and the auxiliary oil supply pump are lower, the height of the circulating oil tank for the main control oil pump and the auxiliary oil supply pump is also lower so that the oil suction port of the main control oil pump and the auxiliary oil supply pump can be located at a lower position below the liquid level. The height of the circulating oil tank at the dual filter ensures the height space for vertically extracting and replacing the filter element inside the tank. A lubricating oil air cooler is distributed on the other side of the plate wall of the tank base. The lubricating oil air cooler is connected to the main control oil pump, the auxiliary oil supply pump, the pneumatic three-way valve, and the dual filter through oil pipelines.

[0007] In a preferred embodiment, the circulating oil tank is equipped with an electric heater, an oil inlet, a level gauge, and two drain outlets on its side. An inspection door is provided near the circulating oil tank on the tank base frame to facilitate operations such as observing the oil level, adding oil to the circulating oil tank, and removing and cleaning the electric heater during maintenance. The tank base frame is tilted upwards in the horizontal direction, and ball valves are connected to the outside of the tank base frame at the lowest point of the two drain outlets to allow oil to be discharged directly from the outside of the tank.

[0008] In a preferred embodiment, the lubricating oil air cooler is connected to the main control oil pump, auxiliary oil supply pump, pneumatic three-way valve, and dual filter via oil pipelines, and also includes the following: The lubricating oil enters the pneumatic three-way valve through the main control oil pump and the auxiliary oil supply pump, and is divided into two oil circuits. One oil circuit is transmitted to the other side of the circulating oil tank through the oil circuit pipeline. In the hot standby state, this oil circuit circulates in the circulating oil tank to ensure that the lubricating oil is heated evenly. The other oil circuit passes through the oil circuit pipeline through the wall plate to the inlet of the lubricating oil air cooler, as shown in the attached figure. During normal circulation, the lubricating oil passes through the lubricating oil air cooler to ensure that the lubricating oil temperature meets the system requirements.

[0009] In a preferred embodiment, the lubricating oil air cooler is provided with four vent ports, and the lubricating oil air cooler is connected to the circulating oil tank through an integrated oil pipeline. The integrated oil pipeline is provided with a sight glass and a shut-off valve. When the lubricating oil starts to circulate, the shut-off valve opens. When the lubricating oil fills the lubricating oil air cooler, the sight glass can see that the pipeline is full of lubricating oil, and then the shut-off valve can be closed.

[0010] In a preferred embodiment, the dual filter is provided with a branch line of a self-regulating pressure regulating valve. By manually controlling the mechanical structure of the self-regulating pressure regulating valve, the flow rate and pressure of the lubricating oil passing through the self-regulating pressure regulating valve can be controlled, thereby controlling the lubricating oil pressure in the main oil circuit.

[0011] In a preferred embodiment, the gearbox has two reducing tee pipes on its side, which are respectively connected to the fuel supply ports of the gas turbine, gearbox, and generator. Each branch of the two reducing tee pipes is equipped with a throttling orifice plate to precisely adjust the flow rate of the branch. Each throttling orifice plate is connected to a branch of the corresponding reducing tee pipe via a flange, so that throttling orifice plates of different diameters can be disassembled and replaced when adjusting the flow rate. An inspection door is also provided on the side of the housing near the three orifice plates to facilitate the replacement of the orifice plates during flow rate testing.

[0012] The main oil circuit is the pipeline from the gearbox into the gas turbine and generator.

[0013] In a preferred embodiment, a return oil pump and an auxiliary return oil pump are stacked and distributed behind the gas turbine, and the return oil pump and the auxiliary return oil pump are bolted to a support frame. The support frame is connected to the base frame of the housing by bolts to prevent the lubricating oil from being contaminated when it is pressurized in the pump. The return oil pump and the auxiliary return oil pump are connected to return oil filters, which are also arranged behind the gas turbine and bolted to the base frame of the housing.

[0014] In a preferred embodiment, the oil return method of the gearbox and the generator is gravity return. There is no equipment obstruction on the oil return pipeline of the generator. Therefore, the oil return pipeline of the generator is provided with a 5° inclination angle so that the lubricating oil can return smoothly to the circulating oil tank. The oil return pipeline of the gearbox is located at its bottom and passes through the base frame of the gearbox to the circulating oil tank.

[0015] In a preferred embodiment, an oil mist separator is installed above the base frame of the housing. The oil mist separator is located on one side of the lubricating oil air cooler. To save space, they are respectively arranged in the space formed by the air inlet and outlet and the ventilation opening above the base frame of the housing. The oil mist separator and the lubricating oil air cooler are connected to the circulating oil tank through oil pipelines. The oil mist separator is provided with an oil mist inlet and a lubricating oil outlet. The lubricating oil outlet pipeline is concentrically arranged inside the oil mist inlet pipeline. Only one through-wall pipe and a matching flange on the housing wall panel are needed to realize the function of two pipelines, which improves the strength of the housing.

[0016] The beneficial effects of this invention are: through the compact structural design and positional arrangement of the oil tank, oil supply pipeline and oil return pipeline, the lubricating oil system can be placed together with the main components of the gas turbine power plant, such as the gas turbine, gearbox and generator, inside the housing. The lubricating oil system is integrated into the housing and a single oil tank provides lubricating oil to the main components of the power plant, which is beneficial for the overall transportation of the power plant housing and effectively reduces the overall footprint of the power plant. The precise control of lubricating oil supply is achieved through multiple structural designs. The combination of the variable diameter tee pipe on the side of the gearbox and the throttling orifice plate can accurately allocate the branch flow according to the different lubrication requirements of the gas turbine, gearbox, and generator. The self-regulating pressure regulating valve adjusts the main oil circuit pressure in real time through the branch pipe to ensure that key components such as bearings of each equipment receive a stable supply of lubricating oil, and avoid insufficient lubrication or component damage caused by excessively high or low pressure. The hot standby cycle and normal cycle are switched by a pneumatic three-way valve. The lubricating oil circulates in a closed loop inside the circulating oil tank. With the help of the electric heater, the temperature rises evenly, avoiding local overheating or uneven heating that may affect the lubrication performance. During normal operation, the lubricating oil flows through the air cooler for heat dissipation. The heat dissipation efficiency of the air cooler is adjusted by the variable frequency motor to ensure that the oil temperature is always maintained within a reasonable range, adapting to the operating requirements under different ambient temperatures and load conditions. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the gas turbine housing; Figure 3 P&ID flowchart for compact layout of lubrication oil system in small-capacity gas turbine power plants.

[0018] 1. Gas turbine; 2. Generator; 3. Gearbox; 4. Circulating oil tank; 5. Electric heater; 6. Oil inlet; 7. Level gauge; 8. Main control oil pump; 9. Auxiliary oil supply pump; 10. Pneumatic three-way valve; 11. Dual filter; 12. Self-regulating pressure regulating valve; 13. Return oil pump; 14. Auxiliary return oil pump; 15. Return oil filter; 16. Oil mist separator; 17. Lubricating oil air cooler. Detailed Implementation

[0019] The present invention will now be further described with reference to the accompanying drawings.

[0020] Appendix Figure 1-3 As shown, this embodiment provides: a compactly arranged lubrication oil system for small and medium power gas turbine power plants. The system includes a housing base frame, as shown in the attached figure. Figure 1 As shown, for the convenience of viewing the overall structure of this application, an appendix is ​​attached. Figure 1The wall panel of the housing base frame is hidden. A gas turbine 1 is installed on the housing base frame. A generator 2 is installed on one side of the gas turbine 1 and located on the housing base frame. The gas turbine 1 is connected to the generator 2 through a gearbox 3 coupling installed on the housing base frame. A circulating oil tank 4 is installed between the gas turbine 1 and the gearbox 3. According to standard API614-2008, the flow rate of the circulating oil tank 4 should be 3 to 5 times the circulation volume of the lubricating oil system per minute. Due to space limitations, the flow rate of the circulating oil tank in this invention is 4 times the circulation volume, with a 20% margin. The maximum liquid level of the circulating oil tank 4 does not exceed the minimum liquid level of the gearbox 3 to prevent poor oil return from the gearbox. The circulating oil tank 4 is equipped with a main control oil pump 8, an auxiliary oil supply pump 9, a pneumatic three-way valve 10, a double filter 11, and a self-regulating pressure regulating valve 12. The height of the main control oil pump 8 and the auxiliary oil supply pump 9 is lower than that of the pneumatic three-way valve 10, the double filter 11, and the self-regulating pressure regulating valve 12. Because the height of the main control oil pump 8 and the auxiliary oil supply pump 9 is low, the height of the circulating oil tank of the main control oil pump 8 and the auxiliary oil supply pump 9 is also low in order to ensure that the oil suction port of the main control oil pump 8 and the auxiliary oil supply pump 9 is at a lower position below the liquid level. The height of the circulating oil tank at the double filter 11 ensures the height space for vertically extracting and replacing the filter element inside the tank. The lubricating oil air cooler 17 is distributed on the other side of the plate wall of the tank base. The lubricating oil air cooler 17 is connected to the main control oil pump 8, the auxiliary oil supply pump 9, the pneumatic three-way valve 10, and the double filter 11 through oil pipelines.

[0021] To save floor space, the system only has one lubricating oil circulation tank. Lubricating oil is supplied to the three main pieces of equipment in the gas turbine power plant via this single tank 4. The main control oil pump 8 and the auxiliary oil supply pump 9 are screw pumps, allowing for vertical mounting above the circulation tank. To reduce equipment complexity and minimize the footprint of the circulation tank, the auxiliary oil supply pump 9 and the emergency oil pump are combined into one unit. Therefore, there are two lubricating oil pumps: a main pump, used during normal operation, and an auxiliary pump connected to an uninterruptible power supply (UPS). When the oil pressure in the lubricating oil system is too low, both the main control oil pump 8 and the auxiliary oil supply pump 9 are activated simultaneously to ensure normal oil circulation. This auxiliary pump is also connected to the UPS; when the gas turbine trips, it is driven by the UPS to supply lubricating oil, allowing the rotating parts of the gas turbine 1 and generator 2 to stop smoothly. Furthermore, in some other specific embodiments, a check valve and a safety valve are provided after the main control oil pump 8 and the auxiliary oil supply pump 9. The check valve prevents the lubricating oil from flowing back into the circulating oil tank. When the pipeline after the oil pump is blocked, the lubricating oil can be released back into the circulating oil tank through the branch pipeline of the safety valve to avoid excessive pressure and potential danger.

[0022] The circulating oil tank 4 is equipped with an electric heater 5, an oil inlet 6, a level gauge 7, and two drain outlets on its side. An inspection door is provided near the circulating oil tank on the tank base frame to facilitate maintenance operations such as observing the level, adding oil to the circulating oil tank, and removing and cleaning the electric heater 5. The tank base frame is tilted upwards in the horizontal direction, and ball valves are connected to the outside of the tank base frame at the lowest point of the two drain outlets to allow oil to be discharged directly from the outside of the tank.

[0023] The lubricating oil air cooler 17 is connected to the main control oil pump 8, the auxiliary oil supply pump 9, and the pneumatic three-way valve 10 and the dual filter 11 via oil pipelines, and also includes the following: Lubricating oil enters the pneumatic three-way valve 10 through the main control oil pump 8 and auxiliary oil supply pump 9, dividing into two oil circuits. One oil circuit is transmitted to the other side of the circulating oil tank 4 via an oil pipeline. In hot standby mode, this oil circuit circulates within the circulating oil tank 4, ensuring uniform heating of the lubricating oil. The other oil circuit passes through the wall plate via an oil pipeline to the inlet of the lubricating oil air cooler 17, as shown in the attached diagram. Figure 3 As shown, during normal circulation, the lubricating oil passes through the lubricating oil air cooler 17 to ensure that the lubricating oil temperature meets the system requirements.

[0024] The pipelines are connected in parallel, and a pneumatic three-way valve 10 is installed. One of the outlets of the three-way valve returns to the other side of the circulating oil tank, and the other leads to the lubricating oil air cooler 17. The circulating oil tank 4 is equipped with an electric heater 5 and a temperature measuring thermocouple. When the temperature of the lubricating oil measured by the thermocouple is low when the machine is started, the system is set to hot standby mode, the electric heater 5 is turned on, and the lubricating oil circulates in the circulating oil tank through the main control oil pump 8, the auxiliary oil supply pump 9, and the pneumatic three-way valve 10, so that the lubricating oil in the circulating oil tank is heated evenly.

[0025] The lubricating oil air cooler 17 is equipped with four vent ports, and the lubricating oil air cooler 17 is connected to the circulating oil tank 4 through an integrated oil pipeline. The integrated oil pipeline is equipped with a sight glass and a shut-off valve. When the lubricating oil starts to circulate, the shut-off valve opens. When the lubricating oil fills the lubricating oil air cooler 17, the sight glass can see that the pipeline is full of lubricating oil, and then the shut-off valve can be closed.

[0026] Furthermore, under normal operating conditions of the gas turbine power plant, the lubricating oil enters the lubricating oil air cooler 17 through pipelines after passing through the main and auxiliary oil pumps and the pneumatic three-way valve 10. The lubricating oil air cooler 17 is controlled by a variable frequency motor. The heat dissipation efficiency of the air cooler is adjusted by the thermocouple installed on the main lubricating oil pipeline, thereby removing the heat generated by the lubricating oil when circulating in the bearing and keeping the temperature of the lubricating oil passing through the air cooler within a reasonable range.

[0027] Then, the lubricating oil returns to the tank through the pipeline and is circulated by the dual filter 11 arranged on the oil tank. The filter removes dust from the pipeline and metal debris from inside the equipment. There is a pressure gauge before and after the dual filter 11. The pressure drop of the lubricating oil in the filter can be obtained by measuring the pressure difference between the two pressure gauges. When the pressure drop is too large, it means that the filter element is too dirty and needs to be replaced.

[0028] The dual filter 11 is equipped with a branch line of a self-regulating pressure regulating valve 12. By manually controlling the mechanical structure of the self-regulating pressure regulating valve 12, the flow rate and pressure of the lubricating oil passing through the self-regulating pressure regulating valve 12 can be controlled, thereby controlling the lubricating oil pressure in the main oil circuit. Furthermore, in some other specific embodiments, a pressure transmitter is installed on the main lubricating oil pipeline. The reading of the pressure transmitter is used to adjust the self-regulating pressure regulating valve 12, so that a portion of the lubricating oil returns to the circulating oil tank through the branch line, thereby regulating the pressure of the lubricating oil in the main oil circuit.

[0029] Two reducing tee pipes are installed on the side of the gearbox 3. The two reducing tee pipes are connected to the oil supply ports of the gas turbine 1, gearbox 3 and generator 2 respectively. Each branch of the two reducing tee pipes is equipped with a throttling orifice plate to precisely adjust the flow rate of the branch. Each throttling orifice plate is connected to the branch of the corresponding reducing tee pipe through a flange so that the throttling orifice plate of different diameter can be disassembled and replaced when adjusting the flow rate. There is also an inspection door on the side of the housing near the three orifice plates to facilitate the replacement of the orifice plates during flow rate testing.

[0030] The main oil circuit consists of a pipeline from gearbox 3 into gas turbine 1 and generator port 2. Further, the lubricating oil enters the two bearing cavities of gas turbine 1, the two bearing cavities of generator 2, and gearbox 3, before returning to the circulating oil tank via a return oil pipeline. The return oil method for gas turbine 1 is forced return, using a set of return oil pumps 13 to pressurize the lubricating oil and return it to the circulating oil tank. Return oil pumps 13 are selected as double gear pumps. The lubricating oil in the two bearing cavities is pressurized through two separate chambers within the pump to prevent pressure differences between the two bearing cavities from interfering with the return oil process. There are two return oil pumps 13: a main oil pump, used during normal operation; and an auxiliary return oil pump 14, connected to an uninterruptible power supply (UPS). This auxiliary pump is activated simultaneously with return oil pump 13 when the oil pressure in the lubricating oil system is too low. This auxiliary pump is also connected to an UPS; when the gas turbine trips, it is driven by the UPS to supply lubricating oil, ensuring normal circulation.

[0031] A return oil pump 13 and an auxiliary return oil pump 14 are stacked and distributed behind the gas turbine 1. The return oil pump 13 and the auxiliary return oil pump 14 are fixed to the support frame with bolts. The support frame is connected to the base frame of the housing with bolts to prevent the lubricating oil from being contaminated when it is pressurized in the pump. The return oil pump 13 and the auxiliary return oil pump 14 are connected to the return oil filter 15, which is also arranged behind the gas turbine 1 and connected to the base frame of the housing with bolts.

[0032] The oil return method of gearbox 3 and generator 2 is gravity oil return. There is no equipment obstruction on the oil return pipeline of generator 2. Therefore, the oil pipeline of generator 2 used for oil return is set with a 5° inclination angle, so that the lubricating oil can return smoothly to the circulating oil tank. The oil pipeline of gearbox 3 used for oil return is set at its bottom and passes through the base frame of the gearbox to the circulating oil tank 4.

[0033] An oil mist separator 16 is installed above the base frame of the housing. The oil mist separator 16 is located on one side of the lubricating oil air cooler 17. To save space, they are respectively arranged in the space formed by the air inlet and outlet and the ventilation opening above the base frame of the housing. The oil mist separator 16 and the lubricating oil air cooler 17 are connected to the circulating oil tank 4 through oil pipelines. The oil mist separator 16 is provided with an oil mist inlet and a lubricating oil outlet. The lubricating oil outlet pipeline is concentrically arranged inside the oil mist inlet pipeline. Only one through-wall pipe and matching flange on the housing wall panel are needed to realize the function of two pipelines, which improves the strength of the housing.

[0034] In summary, the system used in this application has two circulation modes: internal circulation within the circulating oil tank and external circulation outside the circulating oil tank. When the temperature of the lubricating oil in the circulating oil tank is low during startup, the system is set to hot standby mode. The circulating oil tank 4 circulates internally, the electric heater 5 is turned on, and the lubricating oil circulates from the circulating oil tank 4 to the main and auxiliary oil pumps, then to the pneumatic three-way valve 10, and finally back to the circulating oil tank 4.

[0035] After the hot standby is completed, the lubricating oil circulates normally. The flow of the gas turbine 1 branch is as follows: circulating oil tank 4 → main and auxiliary oil pumps → pneumatic three-way valve 10 → lubricating oil air cooler 17 → double filter 11 → self-regulating pressure regulating valve 12 branch pipeline → throttling orifice plate → gas turbine 1 → return oil pump 13 → return oil filter 15 → circulating oil tank 4.

[0036] The flow path of the gearbox and generator branch is as follows: circulating oil tank 4 → main and auxiliary oil pumps → pneumatic three-way valve 10 → lubricating oil air cooler 17 → double filter 11 → self-regulating pressure regulating valve 12 branch line → throttling orifice plate → gearbox 3, generator 2 → return oil line → circulating oil tank 4.

Claims

1. A compact arrangement of a lubricating oil system for small and medium power combustion engine power plants, characterized in that, The system includes a box chassis, a gas turbine (1) is arranged on the box chassis, a generator (2) is arranged on the box chassis on one side of the gas turbine (1), the gas turbine (1) is connected to the generator (2) through a gear box (3) coupler arranged on the box chassis, a circulating oil tank (4) is arranged between the gas turbine (1) and the gear box (3), and the maximum liquid level of the circulating oil tank (4) does not exceed the lowest liquid level of the gear box (3); A main control oil pump (8), an auxiliary oil supply pump (9), a pneumatic three-way valve (10), a double filter (11) and a self-operated pressure regulating valve (12) are installed on the circulating oil tank (4), the height of the main control oil pump (8) and the auxiliary oil supply pump (9) is lower than that of the pneumatic three-way valve (10), the double filter (11) and the self-operated pressure regulating valve (12), lubricating oil air coolers (17) are distributed on the other side of the plate wall of the box chassis, and the lubricating oil air coolers (17) are connected to the main control oil pump (8), the auxiliary oil supply pump (9), the pneumatic three-way valve (10) and the double filter (11) through oil pipeline.

2. A compact arrangement of a lubricating oil system for a small or medium power combustion engine power plant according to claim 1, characterized in that, An electric heater (5), an oil filling port (6), a liquid level meter (7) and two blowdown ports are installed on the side of the circulating oil tank (4), a maintenance door is arranged on the box chassis near the circulating oil tank, the box chassis is in an upwardly inclined state in the horizontal direction, and ball valves outside the box chassis are connected to the lowest positions of the two blowdown ports.

3. A compact arrangement of a lubricating oil system for a small or medium power combustion engine power plant according to claim 1, characterized in that, The lubricating oil air coolers (17) are connected to the main control oil pump (8), the auxiliary oil supply pump (9), the pneumatic three-way valve (10) and the double filter (11) through oil pipelines, and further include the following settings: The lubricating oil enters the pneumatic three-way valve (10) through the main control oil pump (8) and the auxiliary oil supply pump (9), is divided into two oil paths, one of which is transmitted to the other side of the circulating oil tank (4) through an oil pipeline, and in the hot standby state, the oil path circulates in the circulating oil tank (4), and the other oil path passes through the wall plate to the inlet of the lubricating oil air cooler (17) through an oil pipeline.

4. A compact arrangement of a lubricating oil system for a small or medium power combustion engine power plant according to claim 3, characterized in that, Four vent ports are arranged on the lubricating oil air cooler (17), and the lubricating oil air cooler (17) is connected to the circulating oil tank (4) through an integrated oil pipeline, and a sight glass and a stop valve are arranged on the integrated oil pipeline.

5. A compact arrangement of a lubricating oil system for a small or medium power combustion engine power plant according to claim 1, characterized in that, A branch pipeline of the self-operated pressure regulating valve (12) is arranged on the double filter (11).

6. A compact arrangement of a lubricating oil system for small and medium power combustion engine power stations according to claim 1, characterized in that, Two variable-diameter three-way pipelines are arranged on the side of the gear box (3), the two variable-diameter three-way pipelines are respectively connected to the oil supply ports of the gas turbine (1), the gear box (3) and the generator (2), throttle orifice plates are arranged on the branch pipelines of the two variable-diameter three-way pipelines, and each throttle orifice plate is connected to the branch pipeline of the corresponding variable-diameter three-way pipeline through a flange.

7. A compact arrangement of a lubricating oil system for a small or medium power combustion engine power plant according to claim 1, characterized in that, An oil return pump (13) and an auxiliary oil return pump (14) are stacked and arranged behind the gas turbine (1), the oil return pump (13) and the auxiliary oil return pump (14) are fixed to a support frame by bolts, the support frame is connected to the box chassis by bolts, and the oil return pump (13) and the auxiliary oil return pump (14) are connected to an oil return filter (15).

8. A compact arrangement of a lubricating oil system for a small or medium power combustion engine power plant according to claim 7, characterized in that, The oil return pipeline of the generator (2) is provided with an inclination angle of 5°, and the oil return pipeline of the gear box (3) is arranged at the bottom of the gear box (3) and penetrates through the bottom frame of the box to the circulating oil tank (4).

9. A compact arrangement of a lubricating oil system for small and medium power combustion engine power plants according to claim 8, characterized in that, An oil mist separator (16) is arranged above the bottom frame of the box, and the oil mist separator (16) is located at one side of the lubricating oil air cooler (17).

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